Means for controlling fluid-transmission gear.



- u. 'LENTZ. MEANS FOR CONTROLLING FLUID TRANSMISSION GEAR.

APPLICATION-FILED MAY 20, 1911. 1,133,-67 Patented M3130, 1915.

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HUG-O LE'NTZ ATTORNEY H. LENTZ.

MEANS FOR CONTROLLING FLUID TRANSMISSION GEAR. APPLIQATION FILED MAY 20,1911.

Patented Mar. 30, 1915.

INVENTOR -HUGO LENTZ WITNESSES WWW u ATT'oRnlEY I H. LENTZ. MEANS FORCONTROLLING FLUID TRANSMISSION GEAR.

APPLIGATION FILED MAY 20, 1911..

Patented Mar. 30, 1915.

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W; Masses lNvEn'roR Hugo Le rz.

ATTORNEY :scweo LENTZ, or enunwann, NEAR BERLIN,'- GERMANY.

MEANS FOR CONTROLLING FLUID-TRANSMISSION GEAR.

7 clear, and exact description of the same.

The present invention relates to improve' ments in the valve controlledfluidtransmission gear described in my co-pending application Serial No.594,192, filed Nov. 25, 1910. In the said application are described andclaimed controlling means whereby a plurality of valves are controlledby a single device, during its progressive movement from one position toanother.

The present inv'entionrelates more particularly to a modification of theabove menti oned gear. whereby is provided a fluidtransmission gearwherein the braking relation is established only after the device hasbeen moved to and past the position giving highest speed. However, it isnoted that the claims herein are not at all limited to the details ofconstruction of the device.

In the gear herein shown, the passages connecting the pumps to themotor, and the motor to the pumps, have such a shape as will prevent asfar as possible any change in direction of the transmission fluid. Thisarrangement is claimed in my co-pending application, Serial No. 629,041,filed May 23, 1911. Aside from the recited considerations, I have found(as hereinafter more fully explained) that it is-high ly advantageous,especially when a single handle is used to control all valves and thebraking, that the braking, by the driven liquid, shall occur immediatelyafter. the liquid motor has attained its highest speed; in such case,the

. I extent of movement of the leverin order to reach the brake position,in case of danger upon throwin in the highest speed-is the shortest. Eacof the advantages'before outlined is attained by the arrangementhereinafter described and claimed.

In the drawings Figure 1 shows diagrammatically and in perspective thelever rods for adjustment of the slide-valves; Fig. 2

' a longitudinal section through the liquid I gear and the controllingdevice; Fig. 3 a

section along line 3-3 of Fig. 2. Fig. 4 shows the speed valve 1) 0together with the Specification of Letters Patent.

Application filed May 20, 1911.

this prolongation c- Patented Mar. 30, 1915. Serial No. 323,594.

slide-valve positions of the gear arrangedforthree gear ratios, for thereverses running light, first, second and third speed and braking-thegear.

As is apparent from Figs. 2 and 3, the

liquid gear for which the adjusting device for the control slide valves,forming the sub ject matter of the invention, is intended,

consists of a closed casing A, within which, adjacent to one another,are arranged. the.

pump set B, B and the. motor set C. In the present case the pump setconsists of 2 pumps .B, B, the delivery capacities of which are, due tothe different widths of the piston, in a ratio of 2-1. The quantity ofliquid delivered one or both of the pumps B, B is forced through thepressure passage D and the pressure chamber D through to the motors Cand after accomplishing its work into the suction chamber S and thenceback to the pumps B, B through the suction passage S. Each of the pumpsB, B is ad ustable by itself and in such manner that by means of thesuitably formed controlling devices shown, for the sake of example, inFigs. 4, 5, 6 and 7, the working liquid can be discharged either intothe pressure chamber D or into the suction chamber S. In the case of thelarge pump B this purpose is served by the control member I) which, bymeans of the pin m provided on its prolongation b, engages the groove mof the sleeve a, as will be later explained more in detail in thedescription of Fig. 8. For the small pump the control member 0 serves,the prolongation c of which passesthrough the central member 5 as wellas through the prolongation Z) of the latter. At the end of which slides.in the groove n of the same sleeve a, as will be later explained in thedescription of Fig. 9. By adjusting the separate pumps, B or B, or bothpumps B, B together, various speeds corresponding to is provided a pin nthe various quantities delivered are obtained, as will be clearlyexplained in the description of Figs. 11 to, 16.

. G is attached to the casing A a. second simi lar casing, in which asleeve is mounted for actuating the reverse member. In. the groove 0 ofthis sleeve d is guided the pin 0 of the reversing member 6, and byproper positioning thereof, as is clearly explained in the descriptionof Figs. 10 to 16, the

' stream forced by the pumps can be either conducted to the motors,which then immediately run in the reverse direction (backward) ordirectly back to the pumps so that no work takes place, and thence thedevice runs light. Each valve is adapted to cover and uncover, atpredetermined times, ports either of one channel or another, and,therocking or other movement of each valve (for such purpose) is controlledby a slide having a zig-zag or other angular groove engaged by aprojection carried by or connected with the valve. It is obvious thatmovements of the slide will cause, correspondingly, movements of thevalve, the extent and direction of such movements being.

dependent upon the direction and the angularity of the grooves or slotsin the slides. A slide may control but one valve .(thus 0 alone iscontrolled by slide (has hereinafter described), or a slide may controla plurality of valves (thus slide a may, as hereinafter described,control two valves 6 and c, which, at times, move in oppositedirections). All such slides may be connected to a common operatingpartas rocking bar it, having an operating handle Z sccuredthereto.Figs. 8 and 9 are different Views of the same non-rotatable slide a,this being hollow and provided, along one side with a slot m, forengagement by a projection carried by or connected with a valve 1)corresponding to the large pump; along its other side the slide hasanother slot, n, for engagement by a projection carried by or connectedwith a valve 0, corresponding to the smaller pump. As shown in Fig. 1,said valves are arranged in series relatively to the slide; theyarcmovable independently one of the other, and rotatable to said slide.

Referring to Fig. 10, this'illustrates in side view, another slide cl,which may also be hollow, provided along one side with a slot o-forengagement by a projection carried'by or connected with a reversingvalve e which is employed also for braking the apparatus, or for criving the fluid at no load. Each slide (a and d) is coupled to arocking shaft or bar It, by meansof tie-rods or links 9 and connected toarms or levers with respect and i secured to and moving with k. Theshaft h is rocked, in either direction and to any extent desired by thehand-lever Z, the

indicated by cated at 7 and all of the slide-valvrpositionscorresponding to the lines 1, that 1s to say, valve iris at the position7/, valve 0 is at position 0', and valve d is at position cl. Thoreupon,the reversing of the gear is brought about, since (as shown in Fig. 11)the valve 0 opens the entrance to a suctionchamber or canal S, whichimmediately becomes a pressure chamber or canal, for liquid dischargedfrom the small pressure pump, while the liquid forced by the larger pumptakes the course indicated by the continuous line-that is through thechamber l), circulating through the same and around its pump withoutstriking against the men: tioned liquidmotor. Upon movement of the leverZ, to the desired extent, all three slides are moved to the positionscorrespondingto lines 2 in Figs. 8l0, valve 5 being fiil'DOSllllOfl 6valve 0 belng at position 0 and valve d being at position (Z all beingthe positions shown in Fig. 12 which corresponds to no-load of the gear.All ports are half opened, so that liquid coming from both "the largeand small pumps can enter both chambers or canals D and S; The nextforward movement of the leve'r- Z, moves all slides to the positionscorresponding to lines 3 in l igs. 8--10, valve 7) being at position 6valve 0 being at position v, and valve (Z being at position (Z Valve 0then keeps its port open (see Fig. 13) to the pressure chamber D,whereupon the liquid from the small pump alone comes into operation,this alone passing from the pressure-chamber D to suction chamber S;this corres onds to the first or low speed of the mot -r. Thev thirdforward movement of the lever Z moves all slides to the positionscorresponding to lines 4 of Figs. 8, 9 and 10, the valves a, and (lbeing'respectively, at the posi-' tions 6*, c and (Z This, as shown inFig. 14, represents the second speed of the motor, since the valve 6connects the larger pump with pressure-chambenD. and the forced liquidfrom that pump alone passes from said chamber to the suction-chamber. Afourth iiorward movement of the lever Z moves the two slides to thepositionscorrespending tolines 5 of each, the valves 7), c and (Z being,respectively,'at the positions 6 c and d. The two valves 6 and 0 bothconduct the pumped liquid directly into the chamber D (see Fig.15) and,after operat-, ing a motor or motors, to'the suction-chamber Thiscorresponds to the highest speed of the apparatus. It will-be noticedthat after the second movement of lever Z, and

including the fifth movement, the valve e j maintains, fully open, theleft hand port or orts' e =leading from the chamber or canal tothe-pump'and also maintains, fully closed, the left-hand port 6 leadingfrom chamber D to the. pump. The port 6 (or there may be two of these)should be large enough not to interrupt or OlIGI BXCBSSlVQ resistance tothe flow ofthe liquid. The same should be trueof port at Of course, thehandle'l may be moved either forwardly or reversely, to any extentdesired, either increasing or decreasing the speed. However, it isdesirable, especially inv case of danger (most likely at'the l11ghestspeed. ofthe gear) to effect braking quickly and. by a shortcontinuation of the movement of the hand-lever l. To efi'ect this, thefinal movement (to the point a: of

Fig. l) movesthe two slides, a and d, to the positionscorresponding tolines6 of each, the valves b and 0 remaining as before, while valvee'is-moved to close the port, or

ports 6. (thus shutting oii the suction cham- -25 her or canal, S)Y andto fully open the port e The liquid forced by the two pumps takes thecourse indicated by the dotted line and also the solid line.that is,circulating through vthe same, li uid motor or motors.

he advantages of the described arrange ment are in having. allvalvesmovable by a .single hand-lever, and in assuringthat the brakingposition can be reached immediately 'from'any olhe'i position, it beingimmaterial Whether the machine is running forward or backward, merely byshifting the hand lever in one continuous direction. A single levermeans not only great simplicity but also an easier supervision of theapparatus, and a lessening of the danger that, at critical moments, -theoperator will notwork the controlling valves 'sufiiciently 1 quickly andcorrectly. The security against error is further assured by the factthat the hand-lever has always to be moved only to its end or extremeposition ,What I claim is: I

1. In a device for controlling fluid transmission gears, a plurality ofvalves for controlling the speed ofa motor and also the braking thereof,said valves having projections,slides having grooves engaged by saidprojections and means for giving sliding movements as desired to saidslides, the grooves of the slides being so formed that the valves areoperated from neutral position, to slow speed, to medium speed, to highspeed, and then to braking position, in the order named by movement ofthe slides in one direction.

2. In a devicefor controlling fluid transmission gears, aplfirality ofvalvesfor conwithout operating the,

trolling the speed of a motor and also the braking thereof, slides foroperating said valves and means, including a single handle, for movingthe slides, the connections of the slides with the valves being suchthat the valves are operated from neutral position, to slow speed, tomedium speed, to high speed, and'then to braking position, in the ordernamed by movement of the-slides in one direction.

3. In a device for controlling fluid trans:

mission gears, a plurality of valves for con trolling the speed of amotor and also the braking thereof, a movable means, and connectionswhereby the valves are operated from neutral position, to slow speed, tomedium'speed, to high speed, and then to braking position, in the ordernamed by movement of the movable means in one di-' rection effecting amovement of the slides in one. direction. i

4. In a device for controlling transmission gears, the combination of amotor;

driving means for driving the motor; a plurality of valves interposedbetween said driving means and the motor for controlling the speed ofthe motorand the braking thereof; and controlling means for effecting a.valve movement corresponding to highest speed of the motor by movementof said controlling means in a certain direction and effecting thebraking movement by move:

6. A regulating device for controlliiig fluid tra'nsmission'gears andcomprising a pair of supplyvalves, operating independ ently of eachother; a single slide for operating both of said valves as desired; abraking valve; a slide for operating the. last-' named valve as desired;a rocking bar; an operating handle connected With said bar; and leverssecured to said bar and connected with both slides aforesaid.

a slide for oper- In testimony whereof, I have signed my name tothis'specification in the presence of two subscribing witnesses. HUGOLENTZ.

Witnesses:

- Janos Klaus,-

A. O. "lrrrarerm.

